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A female science teacher at Thornton Middle School in Cypress-Fairbanks ISD is accused of carrying on a year-long sexual relationship with a former student who had moved on to high school.

According to a complaint from the Harris County District Attorney's office, Kristina Lynn Moore, 48, of Katy, is charged with sexual assault of a child for the alleged relationship, which reportedly began in February 2013 when the 14-year-old male student, then still at Thornton, told investigators he asked Moore for her number and she complied.

The two began text messaging, which quickly escalated to a sexual encounter on Feb. 5, 2013, according to the DA's report. School district records show Moore called in sick to school on that date.

The student told authorities that the two had a number of sexual encounters at his home, Moore's home, the school and at a deserted area of a dead end roadway near a neighboring elementary before the relationship ended in April 2014. Investigators say the student turned over a Valentine's card he claims is from Moore, which reads "you've got this Kat on lockdown...LOL! You always make my 3 wishes come true, ? you, you know who this is...LOL."

According to the DA's office, the alleged relationship was brought to the school's attention by a neighboring teacher who observed suspicious activity. A review of school security tape by the campus principal confirmed the activity.

The teacher and student, who by then had moved on to high school, were interviewed separately but concurrently, according to the DA's report, to prevent them from notifying each other. While Moore denied the relationship, the student admitted it had taken place and provided investigators with details of the alleged incident.